Making the freshest cup of coffee requires grinding the beans yourself. If you do, you know it's fresh and you can adjust how coarse the finished grinds are.
A good grinder will produce an even grind which will give an even extraction of coffee oils. An unbalanced grind will cause some of the coffee to over-extract and some to under-extract. If your coffee is over-extracted it can taste bitter and too pungent. On the other hand if it's under-extracted will taste thin and weak.

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